import java.util.ArrayList;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 东莞呵呵
 * Date:2022-05-25
 * Time:17:21
 */
public class TestDemo {
    public static void main(String[] args) {
        String str1="welcome to bit";
        String str2="come";
        ArrayList<String> arrayList=new ArrayList<String>();
        for (int i = 0; i < str1.length(); i++) {
            char ch=str1.charAt(i);
            if(!str2.contains(ch+"")){

            }
        }
    }
}
